CN108880693A - A method of relevant detection is realized using single photodiode - Google Patents
A method of relevant detection is realized using single photodiode Download PDFInfo
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- CN108880693A CN108880693A CN201810637174.7A CN201810637174A CN108880693A CN 108880693 A CN108880693 A CN 108880693A CN 201810637174 A CN201810637174 A CN 201810637174A CN 108880693 A CN108880693 A CN 108880693A
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- signal
- electric impulse
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- impulse signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
Abstract
The present invention provides a kind of method for realizing relevant detection using single photodiode.Include the following steps：1. the light pulse signal (a and b) that pulse light and pulse local oscillator light through mixing-delay-frequency mixing module, are staggered in output phase.2. above-mentioned light pulse signal is converted to electric impulse signal (c and d) through photodiode and trans-impedance amplifier, electric impulse signal is subjected to branch output.Wherein electric impulse signal makes to mutually stagger in two-way electric impulse signal phase through time delay module all the way, and c2 and d1 same-phase.3. above-mentioned two-way electric impulse signal is exported through subtraction circuit.The present invention can reach the purpose that relevant detection is realized using single photodiode by fine-tuning mixing-delay-frequency mixing module and circuit delay module.Solving in conventional coherent detection method should use two photodiodes to improve the practicability of related detection system the problem of calibration again to the mismatch between two photodiodes.
Description
Technical field
The present invention relates to field of photodetection, in particular to the detection of quantum state in quantum information technology, especially relevant
Detection.
Background technique
With the development of Fibre Optical Communication Technology, coherent light communication with its high sensitivity, message capacity is big, and modulation system is more
Kind multiplicity the advantages that and increasingly by the concern of academia.Be different from Conventional optical communication, the signal detection of coherent light communication with
Demodulation is more needed by related detection system.Because being measured information in photodetector system using light wave as carrier wave, leading to
Cross the change for causing light carrier characteristic parameter (intensity, phase, polarization, frequency and spatial distribution including light) to light wave modulation
Change, then is obtained with tested parameter information by carrying out demodulation to the light carrier for carrying tested parameter information.Relevant detection is just
It is that information entrained by light carrier is detected and handled using the coherence of light, the laser that it only uses coherence good
It is just able to achieve as light source.So theoretically, relevant detection can be detected accurately entrained by light wave amplitude, frequency and phase
Information, but since the frequency of light wave is very high, any photoelectric detector so far all can't direct feeling light wave itself
Amplitude, phase, frequency and polarization variation, can only detection light intensity.Therefore, light can only in most cases be utilized
Interference is seen as detecting the variation that these characteristic parameters of light are finally all converted to luminous intensity.And this conversion is just necessary
Pass through coherent detection technology
Existing photoelectricity coherence detection is to carry out light to the two ways of optical signals after interference using two photodiodes
Electricity conversion, current subtraction, across operations such as resistance amplifications.But due to the sensitivity of photodiode product, responsiveness even optical coupling
There are residual when error existing for difference and fiber optic splitter splitting ratio existing for degree etc. will lead to current subtraction after photoelectric conversion
Remaining signal, this residue signal exist with low frequency, the mode of usually direct current.Circuit can be incited somebody to action when carrying out the amplification of tiny signal rear class
The amplification of this direct current signal, and then circuit output end is caused to add great bias voltage.And this voltage not only results in circuit and satisfies
With can also exceed the input dynamic range of analog-to-digital conversion subcard, bring unnecessary trouble for system.Generally, pass through optical fiber
Delayer and fibre optic attenuator compensate the mismatch of optical path and photodiode, and related detection system can achieve more
High common-mode rejection ratio, but the stability of this method adjusting depends on the stability of delayer and attenuator.With relevant inspection
It surveys device gain to be continuously improved, the precision and stability are also increasingly unable to satisfy requirement.People always require to have more may be used
This is solved the problems, such as by perfect method.
It is excessive in order to solve relevant detection residue signal, the common-mode rejection ratio of related detection system is improved, system is increased
Dynamic range makes the practicability of system and steady it is proposed that a kind of method for realizing relevant detection using single photodiode
Qualitative further promotion.
Summary of the invention
(1) technical problems to be solved
Cause residue signal excessive for element in relevant detection and structure are undesirable, limitation system common-mode inhibits ratio and moves
The problem of state range, the present invention propose a kind of method for realizing relevant detection using single photodiode, are to make pulse local oscillator
Two pulse signals phase shifting after light and pulse signal optical coupling alternately enters same photodiode, and late-class circuit is again
Phase reducing is carried out to the electric impulse signal being staggered in phase, to achieve the purpose that relevant detection.
(2) technical solution
The present invention provides a kind of method for realizing relevant detection using single photodiode, including three steps：
Step 1：Pulse light and pulse local oscillator light are through mixing-delay-frequency mixing module, the light arteries and veins that is staggered in output phase
Rush signal (a and b)；
Step 2：Above-mentioned light pulse signal is converted to electric impulse signal (c and d) through photodiode and trans-impedance amplifier, will
Electric impulse signal carries out branch output.Wherein electric impulse signal makes phase in two-way electric impulse signal phase through time delay module all the way
It is mutually staggered, and c2 and d1 same-phase；
Step 3：Above-mentioned two-way electric impulse signal is exported through subtraction circuit.
Above-mentioned steps successively carry out in sequence.
The pulse light and pulse local oscillator light is through mixing-delay-frequency mixing module, the light arteries and veins that is staggered in output phase
Rush signal (a and b).Step 1 includes the following steps：
Step 1a：Pulse light and local oscillator light are coupled through optical fiber frequency mixer；
Step 1b：Two output end of frequency mixer makes two-arm optical path Length discrepancy by adjusting fiber delay time device；
Step 1c：Light pulse signal (a and b) through being staggered in the exportable phase of optical fiber frequency mixer again.
The light pulse signal is converted to electric impulse signal (c and d), Jiang electricity Mai through photodiode and trans-impedance amplifier
It rushes signal and carries out branch output.Wherein electric impulse signal makes mutually wrong in two-way electric impulse signal phase through time delay module all the way
It opens, and c2 and d1 same-phase.The phase for the light pulse signal that electric impulse signal delay length is staggered with step 1 during this operation
Position is related.Step 2 includes the following steps：
Step 2a：Above-mentioned light pulse signal can switch to electric impulse signal (c and d) through photodiode and trans-impedance amplifier；
Step 2b：According to Kirchhoff's law, electric impulse signal is divided into two-way, is output to follower, follower delays
Punching isolation；
Step 2c：Wherein electric impulse signal makes to mutually stagger in two-way electric impulse signal phase through circuit delay line all the way,
And signal c2 and signal d1 same-phase.
The above-mentioned two-way electric impulse signal is exported through subtraction circuit, this is that the work of amplifier subtraction circuit is former
Reason.Step 3 includes the following steps：
Step 3a：The electric impulse signal of same-phase is exported through subtraction circuit in above-mentioned two-way, the electric pulse of out of phase
Signal is as residue signal；
Step 3b：Subtraction circuit output is after being concerned with detection as a result, wherein residue signal (such as c1 and d2) is cast out.
(3) beneficial effect
The present invention uses single photodiode to realize relevant detection, has reached raising system common-mode and has inhibited ratio and dynamic model
The effect enclosed improves the dependable with function of system.
Detailed description of the invention
Fig. 1 is that the principle of the present invention realizes block schematic illustration
Fig. 2 is a kind of concrete methods of realizing schematic diagram of the invention
Specific embodiment
The present invention is matched by optical fibre device and circuit element and builds single system, and system only uses single two pole of photoelectricity
Pipe realizes relevant detection, and specific step is as follows：
By a kind of Fig. 2 concrete methods of realizing schematic diagram of the invention, related detection system, pulse light and pulse are built
Local oscillator light is by optical fiber frequency mixer, and two-arm output end is by adjusting fiber delay time device, to wherein light pulse signal carries out all the way
Delay appropriate, so that the light pulse being staggered in exportable phase after two optical pulse signals are again introduced into optical fiber frequency mixer
Signal (a and b)；Photoelectric conversion is carried out to light pulse signal using photodetector.According to Kirchhoff's second law, at this time
Voltage pulse signal can be divided into the output of two-way voltage pulse signal；Late-class circuit causes shadow to voltage dividing branch node in order to prevent
It rings, voltage pulse signal need to be buffered and be isolated by voltage follower；Then, wherein voltage pulse signal passes through nothing all the way
Source delay line fine-tunes the delay parameter of passive delay and fiber delay time device, so that voltage pulse signal c2 and voltage arteries and veins
It rushes signal d1 to be completely coincident in phase, subtraction circuit output of the voltage pulse signal of same-phase Jing Guo amplifier, to guarantee
Circuit output end can obtain smaller bias voltage.And head and the tail both ends superfluous signal c1 and superfluous signal d2 can do and give up place
Reason.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (4)
1. a kind of method for realizing relevant detection using single photodiode, which is characterized in that including：
Step 1：Pulse light and pulse local oscillator light are through mixing-delay-frequency mixing module, the light pulse letter that is staggered in output phase
Number (a and b)；
Step 2：Above-mentioned light pulse signal is converted to electric impulse signal (c and d), Jiang electricity Mai through photodiode and trans-impedance amplifier
It rushes signal and carries out branch output.Wherein electric impulse signal makes mutually wrong in two-way electric impulse signal phase through time delay module all the way
It opens, and c2 and d1 same-phase；
Step 3：Above-mentioned two-way electric impulse signal is exported through subtraction circuit.
Above-mentioned steps successively carry out in sequence.
2. a kind of method for realizing relevant detection using single photodiode according to claim 1, which is characterized in that
The step 1 includes the following steps：
Step 1a：Pulse light and local oscillator light are coupled through optical fiber frequency mixer；
Step 1b：Two output end of frequency mixer makes two-arm optical path Length discrepancy by adjusting fiber delay time device；
Step 1c：Light pulse signal (a and b) through being staggered in the exportable phase of optical fiber frequency mixer again.
3. a kind of method for realizing relevant detection using single photodiode according to claim 1, which is characterized in that
The step 2 includes the following steps：
Step 2a：Above-mentioned light pulse signal can switch to electric impulse signal (c and d) through photodiode and trans-impedance amplifier；
Step 2b：According to Kirchhoff's law, electric impulse signal is divided into two-way, is output to follower, follower makees buffer compartment
From；
Step 2c：Wherein electric impulse signal makes to mutually stagger in two-way electric impulse signal phase through circuit delay line all the way, and believes
Number c2 and signal d1 same-phase.
4. a kind of method for realizing relevant detection using single photodiode according to claim 1, which is characterized in that
Include the following steps in the step 3：
Step 3a：The electric impulse signal of same-phase is exported through subtraction circuit in above-mentioned two-way, the electric impulse signal of out of phase
As residue signal；
Step 3b：Subtraction circuit output is after being concerned with detection as a result, wherein residue signal (such as c1 and d2) is cast out.
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| CN109905140A (en) * | 2019-03-19 | 2019-06-18 | 中国科学院半导体研究所 | Radiofrequency signal delayed time system |
| CN111030755A (en) * | 2019-12-02 | 2020-04-17 | 哈尔滨工业大学（深圳） | Analog domain carrier recovery method based on photoelectric cooperation |
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